<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <style type="text/css">
        body, html {width: 100%;height: 100%;margin:0;font-family:"微软雅黑";}
        #allmap{width:100%;height:500px;}
        p{margin-left:5px; font-size:14px;}
    </style>
    <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=XPFOXZxZCZwuGqFninoYGjkPiXhPt5uu"></script>
    <title>缩放地图</title>
</head>
<body>
<div id="allmap"></div>
<p>初始化展示中心点为（116.4035,39.915），缩放级别为8的北京市地图，2秒后，通过设置缩放级别将地图放大到14级</p>
</body>
</html>
<script type="text/javascript">
    // 百度地图API功能
    var map = new BMap.Map("allmap");
    map.centerAndZoom(new BMap.Point(116.4035,39.915),8);
    setTimeout(function(){
        map.setZoom(14);
    }, 2000);  //2秒后放大到14级
    map.enableScrollWheelZoom(true);
</script>
